Pharmaceutical product.



* UNITED STATES PATENT OFFICE.

MAX STERN, OF ELBERFELD, GERMANY, ASSIGNOR TO FABBENFABBIKEN YOBM. FBIEDB. BAYER & (70., 0F ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

PHARMACEUTICAL rnonuc'r.

Ho Application filed August 17, 1911.

To all whom fit 'may concern:

.be of great importance and the production of such a solid and stable compound capable of liberating hydrogen peroxid under suitable conditions very valuable.

I have now discovered a solid stable product containing a definite quantity of H 0 which. in contact with water liberates H 0 .and solutions of H 0 can be at any time prepared from-it containing definite quantities'of H 0 Thisnew compound is protreating carbamid (NH,CO

dueed by N11,) with hydrogen pfroxid or with products or mixtures capa leof vproducing hydrogen peroxid at a temperaturebelow that at-which decomposition, and the formation of products of decomposition, takes place. In general the temperature'should be main tained below C. since urea, in aqueous solution, decomposed, even at this temperature with the formation of carbonate of ammonia, which,-if the solution is not acid, bringsabout further decomposition. The process can be carried out advantageously b gently heating, e. g. at temperatures 0 about 40 C. or below.

In order to illustrate the new process more fully the following examples are given, the parts being by weight:

Example 1: 600 partsof carbamid are dissolved by gentle heating-in 1500 parts of a 30 per cent. hydrogen peroxid solution. The new compound containing about 36.2 per cent. H O, separates on cooling. It can be crystallized from water at about 40 C. It forms colorless prisms which when mixed with water, liberate H 0 and evolve oxygen Specification of Letters Patent.

Patented Feb. 11, 1913.

Serial No. 644,527.

when heated to 85 C. The aqueous solution separates iodin from potassium iodid on acidulation and oxygen if the solution is not acidulated.

Example 2: 170 parts of barium superoxid are added to a solution of arts of carbamid in 500 parts of water. arbonic acid is passed then through the mixture until all superoxid is decomposed. Barium carbonate is removed by filtration. The new compound is isolated from the filtrate by evaporating the filtrate in vacuo at 40 C. Instead of carbonic acid the calculated quantity or more of sulfuric acid, oxalic acid-or phosphoric acid can be used.

Example 3: 600 parts of carbamid are dissolved by gentle heating in 1500 parts of a 20 per cent. hydrogen peroxid solution containing 1.2 per cent. of sulfuric acid. The new compound containing about 36.2 per cent. H O separates on coollng. It

is a stable compound, containing substantially the theoretical content of H 0 and is substantially free from decomposing impurities resulting from the process of production.

I claim 1. Process for producing a new pharmaceutical product, which process consists in treating at .a temperature below that at which decomposition takes lace carbamid (NH,CO-NH,) with hy rogen peroxid, substantially as described.

2. Process for producing. a new pharmaceutical product, which process consists in treating at a temperature below that at which decomposition takes place carbamid with compounds capable of producing hy drogen peroxid, substantially as described.

3. Process for producing a new pharmaceutical product, which process consists in treating at a temperature below that at which decomposition takes place carbamid with hydrogen peroxid containing an acid, substantially as described.

4. Process for producing a new pharmaceutical compound, which process consists in treating at a temperature below that at which decomposition takes place and in the presence of anv acid,- carbamid with -compharmaceutical compound liberating hydropounds capableof producin hydrogen pergen peroxid when mixed with water, suboxid, substantially as descri d. stant-ially as described. 5. The herein described new pharmaceu- In testimonywhereof I have hereunto set 6 tical product having the formula NH my hand in the presence of two subscribing 15 CO-NH,.H,O which forms prisms evolvwitnesses.

ing 0 gen when heated to 85 0., contain- MAX STERN. [11. s.] ing sibs'tantially 36.2 percent. H 0 and Witnesses: being substantially free from decomposing ALBERT F. NUFER,

10 impurities and being a stable and valuable ALFnEoHnNKEL. 

